<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Json
 * @subpackage Server
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Cache.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 * Zend_Server_Cache
 */
require_once 'Zend/Server/Cache.php';

/**
 * Zend_Json_Server_Cache: cache Zend_Json_Server server definition and SMD
 * @category Zend
 * @package Zend_Json
 * @subpackage Server
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Json_Server_Cache extends Zend_Server_Cache {

    /**
     * Cache a service map description (SMD) to a file
     * Returns true on success, false on failure
     * @param string $filename
     * @param Zend_Json_Server $server
     * @return boolean
     */
    public static function saveSmd ($filename, Zend_Json_Server $server) {
        if ( ! is_string ($filename) || ( ! file_exists ($filename) &&  ! is_writable (dirname ($filename)))) {
            return false;
        }
        if (0 === @file_put_contents ($filename, $server -> getServiceMap () -> toJson ())) {
            return false;
        }
        return true;
    }

    /**
     * Retrieve a cached SMD
     * On success, returns the cached SMD (a JSON string); an failure, returns
     * boolean false.
     * @param string $filename
     * @return string false
     */
    public static function getSmd ($filename) {
        if ( ! is_string ($filename) ||  ! file_exists ($filename) ||  ! is_readable ($filename)) {
            return false;
        }
        if (false === ($smd = @file_get_contents ($filename))) {
            return false;
        }
        return $smd;
    }

    /**
     * Delete a file containing a cached SMD
     * @param string $filename
     * @return bool
     */
    public static function deleteSmd ($filename) {
        if (is_string ($filename) && file_exists ($filename)) {
            unlink ($filename);
            return true;
        }
        return false;
    }

}
